Sanyo HIT HIP195DA3 195 watt Bifacial solar panel, 16.1% solar module efficiency rating, pallet price. The back face of a HIT Double solar panel generates electricity from ambient light reflected off surrounding surfaces, and combines with power from the front face of the solar panel. Depending upon system design and site location, this results in up to 30% higher power generation (more kWh) per square foot.